Method of manufacturing biological water treatment contact material

Abstract

A plastic contact material is disclosed for the treatment of a liquid, comprising a plurality of strips made of a plastic material and wherein each of the strips has at least one tension element. A process is also disclosed for manufacturing a biological water treatment contact material made of a plurality of strips of a plastics material, which process comprises providing at least one strand at an elevated temperature, and applying the strand to a strip of plastic material while the strand is still at said elevated temperature.

What is claimed is: 
     
       1. A process for manufacturing a biological water treatment contact material of a plurality of strips of a plastic material, comprising: providing a plurality of strands at an elevated temperature;   continuously applying the strands to a web of material; and   continuously severing the web of material between adjacent strands for forming side by side strips.   
     
     
       2. The process as claimed in claim 1 further comprising: after said plurality of strands and said web are joined, passing them through a cooling means to cause crimping of said web.   
     
     
       3. The process as claimed in claim 1 further comprising: allowing said strands to cool;   continuously dividing said web between pairs of adjacent strands to form separate side by side strips; and   suspending the dividing of said web at regular intervals to define a holding web connecting together said side by side strips.   
     
     
       4. The process as claimed in claim 3 further comprising: providing a plurality of webs of materials in an overlying relationship and joining said webs at said holding web.   
     
     
       5. The process as claimed in claim 3 comprising: allowing said strands to cool;   winding said web onto a storage reel;   removing a plurality of webs from a plurality of storage reels;   arranging said webs in an overlying relationship;   cutting said webs; and   bonding said webs together at said holding web.